Question

Deltoid ridge is found in which one of the following bones?
a. Radius
b. Ulna
c. Humerus
d. Femur

Answer 1

According to human anatomy, the deltoid tuberosity is an area on the front-side or an anterolateral side in the middle of humerus bone. This is a rough and triangular area. Humerus is the longest bone of the arm present in-between shoulder and elbow.

Complete answer:

Forelimbs of a Human being consist of many bones, that are, humerus, carpals, metacarpals, radius and phalanges. Let’s talk about each type of these bones:

Phalanges are the bone structure present in the hand of a human being, having a digital formula as 2-3-3-3-3.

Humerus bone is the longest bone of the arm and is located in-between the shoulder and elbow joints.

Now, talking about radius bone, sometimes it is also called a radial bone, it is a long bone which starts from the elbow joint to the thumb side of the wrist. And it is parallel to ulna bone. Ulna bone also starts from the elbow joint and moves to the last finger of hand.

Carpals and metacarpals are sets of irregular shaped bones present in the wrist and hands. Carpal bones are proximal bones and they are a total eight in number. Whereas, metacarpals are a total of five in number and each one can be symbolised with digits.

Now, from this bone anatomy of the forelimb we can say that Deltoid ridge is present in the humerus bone of the forelimb of humans. So, in given options we have option ‘C’ as humerus bone.

Hence, The correct answer is, option (C).

Note: The deltoid ridges are important points of muscle attachment in humerus bone. Humerus bone is the longest bone of the forelimb. Please do not get confused with the fact that the longest bone in the human body is femur.